Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa59cdfbb474e792ccb6ef38cf9db569b11568a4e6c3bfbdbcde0f79334fc12' 
  AND token = 'G3eaBLd1TWAYYEt3gHwJrzCPtBJ2WxfFWD1/m2ZCIQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}